Question

explain why friction is called necessary evil?

Answer 1

if we don't have friction then nothing will be stopped in this whole world
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Answer 2

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Friction has both advantages and disadvantages listed below so it is called a necessary evil.

Advantages

• It allows us to grip or catch any object

• Helps us to walk comfortably on the floor

• Helps to minimize the speed or stop any moving object.

• Helps us to write.

Disadvantages

• It causes wear and tear in objects

• It causes damages to parts of machines and tools and prevents their proper working

• Reduces the speed of moving objects so more force is required

• Friction generates heat and causes wastage of energy